216535590872 has 8 divisors (see below), whose sum is σ = 406004232900. Its totient is φ = 108267795432.

The previous prime is 216535590833. The next prime is 216535590881. The reversal of 216535590872 is 278095535612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×216535590872² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13533474422 + ... + 13533474437.

Almost surely, 2^216535590872 is an apocalyptic number.

It is an amenable number.

216535590872 is a deficient number, since it is larger than the sum of its proper divisors (189468642028).

216535590872 is a wasteful number, since it uses less digits than its factorization.

216535590872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27066948865 (or 27066948861 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 53.

The spelling of 216535590872 in words is "two hundred sixteen billion, five hundred thirty-five million, five hundred ninety thousand, eight hundred seventy-two".